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Section 780.21(c) Continued. <br />Rule 2.05.6(3) <br />Revised 12/3/80 <br />line period. Elevation of TAS levels due to evaporation of water <br />in ponds was observed in Williams Draw and was canbined with flora <br />data to estimate salt discharge. Surface water sample sites 313, <br />upstream from the mine plan area, arm 307, downstream from the mine <br /> plan area, and USGS Gaging Station 06619420 are shown on Map 16a, <br /> Kerr rune Area Surface Water Hydrology. Data frcan these stations <br /> and calculations of salt discharge is given below: <br /> Salt Salt <br />Sample Site 313 Site 307 Difference Salt Load Flow Discharge Discharge <br />Date TLLS{„ig/1) TDS(mg/1) (mq/1) (g/cf) (cf/s) (g/s) (g/d) <br />4/23/80 128 156 28 0.001 4.59 0.0045 388.8 <br />5/ 7/80 724 720 0 0 6.91 - - <br />5/22/80 588 768 180 0.006 0.20 0.0013 112.3 <br />6/ 4/80 824 1420 596 0.021 0.01 0.002 17.3 <br /> Average salt discharge (gram day) 172.3 <br />Based on the data shown in Figure 7, Kev~r Mine Area Surface Water <br />Flow 'r_ydrolographs, there were 62 days of flow in Williams Draw in <br />1980. The average salt discharge of 172.3 grams per day times 62 <br />days gives an assumed annual salt discharge of 10.7 kilograms per <br />yaar fran the mine plan area into Williams Draw. Considering the <br />respective arrount of disturbed area tributary to each of Boltnn, <br />Bush, TrTilliams and Sudduth Draws, the total amount of salt loading <br />on receiving strums is estimated to be about 54 kilograms per year. <br />Tenn Effects <br />The only long-term effects of mining on the hydrologic balance are <br />dissolved salt load and changes in the ion balance of runoff from <br />the disturbed area. As previously stated, data on salt load krill <br />be collected and reported on an annual basis. Data on t~*ater chemis- <br />780-125 hhhhh <br />